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Multiple Choice Questions

1 . Which of th e following s tatem ents is correct a bou t receptors?

(a) Gu sta tory receptors detect tas te while olfactory receptors d etect smell

(b) Both gust atory and olfactory receptors detect smell(c) Au ditory receptors detect s mell an d olfactory receptors detect tas te

(d) Olfactory receptors detect taste an d gus tatory receptors sm ell

2 . Electrical imp u lse tr avels in a neu ron from

(a) Dendr i te axon axonal end cell body

(b) Cell body dendri te axon axonal end

(c) Dendri te cell body axon axonal end

(d) Axona l end axon cell body dendri te

3 . In a syna pse, chem ical signal is tra ns mitted from

(a) dendri t ic end of one neu ron to axonal end of an other neu ron

(b) axon to ce ll body of the s am e neu ron

(c) cell body to axona l end of th e sam e neu ron

(d) axonal end of one neu ron to dend rit ic end of an other neur on

4 . In a n eur on, conversion of electrical signa l to a chem ical signa l occurs at/ in

(a) cell body

(b) axona l end

(c) dendri t ic end

(d ) a xon

5 . Which is th e correct sequen ce of th e compon ents of a r eflex arc?

(a) ReceptorsMuscles Sensory neuronMotor neu ron Spinal cord

(b) ReceptorsMotor neu ron Spinal cord Sensory neuron Muscle

(c) Receptors Spina l cord Sensory neuron Motor neu ron Muscle

(d) Receptors Sensory neuron Spin al cord Motor neu ron Muscle

Control and

Coordination

7CHAPTER

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E XEMPLAR P R O B L E M S SCIENCE5 8

6 . Wh ich of th e followin g st atem ent s ar e tru e?

(i) Sud den a ction in response to something in th e environm ent is

called r eflex action

(ii) Sensory neu rons carry s igna ls f rom spinal cord to m u scles

(iii) Motor neu rons carry sign als from r eceptors to sp in al cord

(iv) The pa th th rough which signa ls ar e trans mitted from a receptor

to a m u scle or a glan d is called reflex arc

(a ) (i) a n d (ii) (b) (i) a n d (iii)

(c) (i) a n d (iv) (d) (i) , (ii) a n d (iii)

7 . Wh ich of th e followin g statem ents are tru e abou t th e brain?

(i) The m ain th ink ing par t of bra in i s hind b ra in

(ii) Centres of h earing, sm ell, mem ory, sight etc a re located in fore

brain.

(iii) In volu n tary actions like sa livation, vomiting, b lood p ress u re

are controlled by the m edu lla in th e hind b rain

(iv) Cerebellu m does n ot control postu re an d balan ce of th e body

(a ) (i) an d (ii) (b ) (i), (ii) a n d (iii)

(c) (ii) a n d (iii) (d) (iii) a n d (iv)

8 . Postu re an d ba lance of th e body is cont rolled by

(a ) cerebrum

(b) cerebellu m

(c) medu lla

(d ) p on s

9 . Spin al cord originat es from

(a) cerebrum

(b) medulla

(c) p on s

(d) cerebellu m

1 0 . Th e m ovemen t of shoot toward s l ight is

(a) geotropism

(b) hydrot rop ism

(c) chemotropism

(d) photot rop ism

1 1 . Th e ma in fu n ction of ab scisic acid in p lants is to

(a) increas e th e length of cells

(b) prom ote cell division

(c) inh ibit growth

(d) promote growth of s tem

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E XEMPLAR P R O B L E M S SCIENCE6 0

1 9 . The m ovemen t of su nflower in accordan ce with th e path of su n is

due to

(a) photot ropism

(b) geotropism

(c) chemotropism

(d) hydrot rop ism

2 0 . The substance that tr iggers the fal l of mature leaves and fruits

from plants is du e to

(a ) a u x in

(b) gibberellin

(c) abs cisic acid

(d) cytokinin

2 1 . Which of th e followin g statem ents abou t tra ns miss ion of nerve

imp u lse is incorrect?

(a) Nerve imp u lse tra vels from den drit ic end towards a xonal end

(b) At the den dritic end electrical impu lses br ing abou t the releas e

of some ch emicals wh ich genera te an electrical imp u lse a t th e

axonal end of an other neu ron

(c) The ch emicals released from the a xona l end of one neu ron cross

the synapse and generate a similar electrical impulse in a

dend rite of an other neu ron

(d) A neu ron t ra ns mits e lec tr ica l imp u lses n ot only to another

neu ron bu t a lso to mu scle an d glan d cells

2 2 .Involu nt ary actions in th e body are controlled by(a) medu lla in fore bra in

(b) medu lla in m id bra in

(c) medu lla in hind bra in

(d) medu lla in spinal cord

2 3 . Wh ich of th e followin g is n ot an involu n ta ry action?

(a) Vomiting

(b) Salivation

(c) Heart beat

(d) Chewing

2 4 . Wh en a person is s u ffering from s evere cold, h e or sh e can not

(a) differentiate th e tas te of an app le from t ha t of an ice cream

(b) differentiate th e sm ell of a p erfu me from th at of an agarbatti

(c) differen tiate red light from green light

(d) differen tiate a h ot object from a cold object

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CONTROL AND CO-ORDINATION 61

2 5 . Wh at is th e correct direction of flow of electrical im pu lses?

(a)

(b)

(c)

(d)

Fig. 7.1

2 6 . Which sta tement i s n ot t rue ab out th yroxin?

(a) Iron is ess ential for the s ynth esis of thyroxin

(b) It regu lates carboh ydrates, protein an d fat m etabolism in the body

(c) Thyroid glan d requ ires iodin e to synth esise thyroxin

(d) Thyroxin is also called th yroid h ormon e

2 7 . Dwarfism resu lts du e to

(a) Excess secretion of thyroxin

(b) Less s ecretion of growth h ormone

(c) Less secretion of adrena line

(d) Excess s ecretion of growth horm one

2 8 . Dramatic changes of body features associated with puberty are

ma in ly becau se of secretion of

(a) oestrogen from testes a nd tes tosterone from ovary

(b) estrogen from adren al glan d an d testosterone from pituitary glan d

(c) testosteron e from testes an d estrogen from ovary(d) testosterone from th yroid glan d an d estrogen from pituitary glan d

2 9 . A doctor advised a pers on to tak e an in jection of insu lin becau se

(a) his blood pressu re was low

(b) his h ear t was beat ing slowly

(c) he was su ffering from goitre

(d) h is s u gar level in blood was h igh

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E XEMPLAR P R O B L E M S SCIENCE6 2

3 0 . Th e horm one which incr eas es th e fertility in ma les is called

(a) oestrogen

(b) testosterone

(c) ins ulin

(d) growth h ormone3 1 . Which of th e following en docrine glan ds is u n paired?

(a ) Adrena l

(b) Testes

(c) Pitui tary

(d) Ovary

3 2 . J u n ction between two neu rons is called

(a) cell ju nction

(b) neuro mu scula r jun c t ion

(c) neu ral joint

(d ) syn a p se

3 3 . In h um an s, the l ife processes are controlled an d regula ted by

(a) reproduct ive an d endocrine systems

(b) respira tory an d nervous systems

(c) endocrine and d igestive systems

(d) ne rvous and endocr ine s ys tems

Short A nswer Questions

3 4 . Lab el the p ar ts (a), (b), (c) an d (d) an d s h ow th e direction of flow of

electrical sign als in Figure 7 .2.

Fig. 7 .2

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CONTROL AND CO-ORDINATION 63

3 5 . Nam e th e plant horm ones respon sible for th e following

(a) elon gation of cells

(b) growth of s tem

(c) pr omotion of cell division

(d) falling of sen escen t leaves.

3 6 . Label the en docrin e gland s in Figu re 7.3.

Fig. 7.33 7 . In Figure 7 .4 (a), (b) an d (c), which ap pear s m ore accu rat e an d why?

Fig. 7.4

3 8 . Label the pa rts of a n eur on in Figure 7.5.

Fig. 7.5

3 9 . Match th e term s of Colu m n (A) with th ose of Colu m n (B)

Co lum n (A) Colum n (B)

(a) Olfa ctory recep tors (i) Ton gu e

(b) Thermo recep tors (t empera ture recep tors ) (ii) Eye

(c) Gu s ta toreceptors (iii) Nose

(d) Ph otorecep tors (iv) Sk in

4 0 . Wha t is a tropic movemen t? Explain with an examp le.

4 1 . What will h ap pen if inta ke of iodine in ou r d iet is low?

4 2 . What happens a t t he s ynaps e be tween two neurons?

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4 3 . An swer th e followin g :

(a) Which h ormone is respon sible for the ch an ges n ot iced in

fema les at pu berty?

(b) Dwarfism resu lts d u e to deficiency of which horm one?

(c) Blood su gar level rises du e to deficiency of which h ormon e?

(d) Iodine is necessa ry for the synth esis of which horm one?

4 4 . An swer th e followin g :

(a) Nam e the end ocrine glan d as socia ted with bra in?

(b) Which glan d s ecretes d igestive enzymes as well as h ormones ?

(c) Nam e th e endocrine glan d a ssocia ted with kidneys?

(d) Which endocrine glan d is present in m ales bu t not in females?

Long Answer Questions

4 5 . Draw the s t ru cture of a n euron an d expla in i t s fu nct ion.

4 6 . Wha t are th e ma jor par ts of the br a in? Ment ion the funct ions of

different pa rts .

4 7 . Wha t cons titu tes the central and periph eral nervous s ystems? How

are th e compon ents of centra l nervous s ystem protected?

4 8 . Mention one fun ction for each of thes e horm ones :

(a) Thyroxin

(b) Ins ul in

(c) Adren aline

(d) Growth h ormone

(e) Testosterone.

4 9 . Name var iou s p lan t h orm ones . Also give th eir ph ysiological effects

on plant growth an d development .

5 0 . Wh at a re reflex actions ? Give two exam ples. Explain a reflex arc.

5 1 . Nervous an d h ormona l system s together perform th e fu nction of

control and coordina tion in h u ma n beings. J u stify the sta tement.

5 2 . How does ch emical coordin ation tak e place in an ima ls?

5 3 . Why is th e flow of sign als in a syna pse from axona l end of one

neu ron to dendri t ic end of an other neu ron bu t not the reverse?